import Vue from 'vue'
import Router from 'vue-router'
import Login from '../components/Login.vue'
import Home from  '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'
import Cate from '../components/goods/Cate.vue'
import Params from '../components/goods/Params.vue'
import GoodsList from '../components/goods/List.vue'
import Add from '../components/goods/Add.vue'
import Order from '../components/order/Order.vue'
import Report from  '../components/report/Report.vue'

Vue.use(Router)

const router = new Router({
    routes: [
        { path: '/' , redirect: '/login'},
        { path: '/login', component: Login},
        {
            path: '/home',
            component: Home,
            redirect: '/welcome',
            children: [
                { path : '/welcome' , component: Welcome},
                { path : '/users' , component: Users},
                { path : '/rights' , component: Rights},
                { path : '/roles' , component : Roles},
                { path : '/categories' , component : Cate},
                { path : '/params' , component : Params},
                { path : '/goods' , component : GoodsList},
                { path : '/goods/add' , component : Add},
                { path : '/orders' , component : Order},
                { path : '/reports' , component : Report}
            ]
        }
    ]
})

//挂载路由导航守卫
router.beforeEach((to,from,next) => {
    // to 将要访问的路径
    // from 代表从哪个路径跳转而来
    // next 是一个函数，表示放行


    // 如果用户访问的登录页，直接放行
    if( to.path === '/login') return next()
    // 从sessionStorage 中获取保存的token值
    const tokenStr = window.sessionStorage.getItem('token')
    // 没有token，强制跳转到登录页
    if( !tokenStr ) return next('/login')
    next()
})


export default router
